US1820543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light projection apparatus
Assignee: Individual
•
Filing: 1926-09-22
•
Granted: 1931-08-25
•
Expires: 1946-09-22
Abstract
No abstract record available.
Inventors
- 👤 George B Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:11
CPC Classifications
F; F21; F21S; F21S41/00; F21S41/40; F21S41/43; F21S41/435; F21S41/10; F21S41/14; F21S41/162; F21S41/20; F21S41/28; F21S41/30; F21S41/32; F21S41/321; F21S41/36; F21S41/365; F21S41/39; F21S41/19; F21S41/194
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-08-24 | 1935-02-23 | 1935-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-08-24 | 1939-02-23 | 1939-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-08-24 | 1943-02-23 | 1943-08-25 | $7700.00 | Window Closed / Lapsed |